答案:B
A small plane crashed into a hillside five miles east of the city, _________ all the four people on board.
A.killed
B.killing
C.having killed
D.to kill
固体废物的收集方式,根据收集的时间可以分为()。
A、混合收集
B、定期收集
C、分类收集
D、随时收集